Building block type battery box base



FIG. 1 is a Perspective view of a building block type battery box base showing my new design;

FIG. 2 is a Front view thereof;

FIG. 3 is a Back view thereof;

FIG. 4 is a Right-side view thereof;

FIG. 5 is a Left-side view thereof;

FIG. 6 is a Top view thereof;

FIG. 7 is a Bottom view thereof; and,

FIG. 8 is other Perspective view of a building block type battery box base showing in open position.

The broken lines in the drawings depict portions of the building block type battery box base that form no part of the claimed design. 

CLAIM We claim the ornamental design for a building block type battery box base, as shown and described. 